Securing Critical Infrastructure Networks with Industrial Cybersecurity

Application Area: Operational Technology Cybersecurity and Critical Infrastructure Modernization
Industry Sector: Water and Electricity Utilities

Operating across water and electricity distribution networks serving approximately 250,000 consumers, a large North American utility faced expanding operational technology (OT) vulnerabilities as legacy operating infrastructure grew increasingly interconnected. Insufficient network segmentation and unhardened remote access pathways created risks of unauthorized network entry. Concurrently, limited operational asset visibility and an absence of in-house industrial cybersecurity specialists complicated the detection of emerging threats across critical process control networks.

Architectural Assessment and Network Segmentation
To address vulnerabilities across aging field assets, the utility deployed an industrial cybersecurity architecture structured around the NIST Cybersecurity Framework. The deployment commenced with an exhaustive digital asset inventory audit across plant operations. This baseline audit identified previously uncatalogued endpoint devices on the plant floor, enabling engineering teams to evaluate specific operational vulnerabilities and map out active communication vectors across the distribution grid.

Network engineers subsequently isolated operational segments by dividing the network into functional subnetworks. This structural segmentation controls internal data traffic flows, isolates critical automation processes, and restricts lateral movement in the event of unauthorized network entry.

Redundant Industrial Compute and Perimeter Hardening
Physical and virtual system reliability was upgraded through the implementation of dual virtualized Industrial Data Centers (IDCs) configured with cross-backups and managed support services, replacing a legacy single-managed IDC configuration. To secure the operational perimeter, Rockwell Automation deployed an Industrial Demilitarized Zone (IDMZ) stretched across both data centers, isolating operational technology systems from corporate networks while permitting controlled data exchange.

“The dedicated OT virtualized compute infrastructure hosts a stretched IDMZ across two IDCs, to permit a site redundant IDMZ. The utility leaders were serious about maintaining the uptime of their critical and remote operations, even in the event of a plant disaster,” stated Robert Matear, who led business development for connected services at Rockwell Automation.

Controlled Access and Continuous Threat Detection
Perimeter protection was complemented by Secure Remote Access (SRA) protocols incorporating role-based access control (RBAC) and privileged access management (PAM) to control elevated credentials. A managed detection and response service was established to conduct continuous operational traffic monitoring, identifying anomalies and unauthorized intrusion attempts across field networks.

The modernised architecture established a redundant operational technology foundation, providing continuous 24/7 remote monitoring, administration, patching, and lifecycle maintenance without disrupting public water and power delivery. Real-time asset tracking mitigated obsolescence risks across legacy machinery, while managed detection services reduced the internal engineering burden and fortified network perimeter defenses against unplanned operational downtime.

Edited by Romila DSilva, Induportals Editor, with AI assistance.